What is the distance from of the mars to the sun in AU?

It varies with each planet's position in its orbit. Mars is farther out from the Sun, and orbits more slowly than the Earth does.

At the "conjunction", when the two planets are closest together, they are about .5 AU apart. But 8 months later, when Earth has raced ahead and is now on the opposite side of the Sun from Mars, the distance is about 1.5 AU.